The effects of hydrogen on the combustion, performance and emissions of a turbo gasoline direct-injection engine with exhaust gas recirculation

2017 ◽  
Vol 42 (39) ◽  
pp. 25074-25087 ◽  
Author(s):  
Joonsuk Kim ◽  
Kwang Min Chun ◽  
Soonho Song ◽  
Hong-Kil Baek ◽  
Seung Woo Lee
Keyword(s):  
Direct Injection ◽  
Exhaust Gas Recirculation ◽  
Gasoline Direct Injection ◽  
Exhaust Gas ◽  
Direct Injection Engine ◽  
Combustion Performance ◽  
Gasoline Direct Injection Engine ◽  
Performance And Emissions ◽  
Gas Recirculation

Extending Lean and Exhaust Gas Recirculation-Dilute Operating Limits of a Modern Gasoline Direct-Injection Engine Using a Low-Energy Transient Plasma Ignition System

2016 ◽  
Vol 138 (11) ◽  
Author(s):  
James Sevik ◽  
Thomas Wallner ◽  
Michael Pamminger ◽  
Riccardo Scarcelli ◽  
Dan Singleton ◽  
...  
Keyword(s):  
Direct Injection ◽  
Exhaust Gas Recirculation ◽  
Low Energy ◽  
Gasoline Direct Injection ◽  
Combustion Stability ◽  
Exhaust Gas ◽  
Ignition System ◽  
Plasma Ignition ◽  
Gas Recirculation ◽  
Transient Plasma

The efficiency improvement and emissions reduction potential of lean and exhaust gas recirculation (EGR)-dilute operation of spark-ignition gasoline engines is well understood and documented. However, dilute operation is generally limited by deteriorating combustion stability with increasing inert gas levels. The combustion stability decreases due to reduced mixture flame speeds resulting in significantly increased combustion initiation periods and burn durations. A study was designed and executed to evaluate the potential to extend lean and EGR-dilute limits using a low-energy transient plasma ignition system. The low-energy transient plasma was generated by nanosecond pulses and its performance compared to a conventional transistorized coil ignition (TCI) system operated on an automotive, gasoline direct-injection (GDI) single-cylinder research engine. The experimental assessment was focused on steady-state experiments at the part load condition of 1500 rpm 5.6 bar indicated mean effective pressure (IMEP), where dilution tolerance is particularly critical to improving efficiency and emission performance. Experimental results suggest that the energy delivery process of the low-energy transient plasma ignition system significantly improves part load dilution tolerance by reducing the early flame development period. Statistical analysis of relevant combustion metrics was performed in order to further investigate the effects of the advanced ignition system on combustion stability. Results confirm that at select operating conditions EGR tolerance and lean limit could be improved by as much as 20% (from 22.7 to 27.1% EGR) and nearly 10% (from λ = 1.55 to 1.7) with the low-energy transient plasma ignition system.

Combined effects of internal exhaust gas recirculation and tumble motion generation in a flex-fuel direct injection engine

2020 ◽  
Vol 217 ◽  
pp. 113007 ◽  
Author(s):  
Augusto César Teixeira Malaquias ◽  
Nilton Antônio Diniz Netto ◽  
Roberto Berlini Rodrigues da Costa ◽  
José Guilherme Coelho Baêta
Keyword(s):  
Direct Injection ◽  
Exhaust Gas Recirculation ◽  
Exhaust Gas ◽  
Combined Effects ◽  
Motion Generation ◽  
Direct Injection Engine ◽  
Flex Fuel ◽  
Gas Recirculation
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